Threat Level

What the threat levels mean

Threat levels are designed to give a broad indication of the likelihood of a terrorist attack.

• LOW means an attack is unlikely
• MODERATE means an attack is possible, but not likely
• SUBSTANTIAL means an attack is a strong possibility
• SEVERE means an attack is highly likely
• CRITICAL means an attack is expected imminently

Members of the public should always remain alert to the danger of terrorism and report any suspicious activity to the police on 999 or the anti-terrorist hotline: 0800 789 321. If your information does not relate to an imminent threat, you can also contact MI5 via the How you can help us page.

.

National Counter Terrorism Security Office - 'Protect Yourself - A Guide to Personal Safety' Link.